{
  "server": {
    "port": 2525,
    "auth": {
      "user": "admin",
      "pass": "your-secure-password"
    }
  },
  "providers": [
    {
      "name": "Gmail",
      "host": "smtp.gmail.com",
      "port": 587,
      "secure": false,
      "auth": {
        "user": "your-email@gmail.com",
        "pass": "your-app-password"
      },
      "from": "your-email@gmail.com"
    },
    {
      "name": "SendGrid",
      "host": "smtp.sendgrid.net",
      "port": 587,
      "secure": false,
      "auth": {
        "user": "apikey",
        "pass": "your-sendgrid-api-key"
      },
      "from": "noreply@yourdomain.com"
    },
    {
      "name": "Mailgun",
      "host": "smtp.mailgun.org",
      "port": 587,
      "secure": false,
      "auth": {
        "user": "postmaster@your-domain.mailgun.org",
        "pass": "your-mailgun-password"
      },
      "from": "noreply@yourdomain.com"
    }
  ],
  "queue": {
    "maxRetries": 5,
    "retryDelay": 60000
  }
}